Printer s quoin



(N0 MOdQII.)

W. R. WHI'I'MG-{IEl PRINTER,S QUOINI No. 334,500. Patented Jan. 19,1886.

f77/vena@ ilNiTnn raras WILLIAM R. WHITMORE, OF NEWBURYPORT, MASSACHUSETTS.

PRINTERS QUOIN.

SPECIFICATION forming part of Letters Patent No. 334,500, dated January 19, 1886. Application filed November 24, 1884. Serial No. 148,703. (No model.)

.To all whom it may concern:

Be it known that I, WILLIAM B. WHIT-4 MORE, a citizen of the United States, residing in Newburyport, in the county of lEssex and State of Massachusetts, have invented a new and useful Improvement in Printers Quoins, being a contrivance for locking up forms in a printing-office, and designed especially for the foot of each column in newspaper-forms; and I do hereby declare that the following is a clear, full, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of vthis specification, in which the same letters refer to the same parts in all the drawings, and in which- Figure lis a perspective View. Fig. 2 is a sectional View on the line .r x. Fig. 3 shows a section on the lines ab and c d, and Fig. 4 is a plan view showing the quoin partly eX- panded.

The two parts A and B, opposite though similar in construction, have each an outer or bearing surface, f g, as they are placed in po sition, which are planes parallel one with the other, and on the inner side, toward the other, a projection, h,whose plane shape is a 'portion of a circle, the center of the circle being the center of the quoin, which projection h is countersunk on both top and botto1n,and bears a section of a scroll-thread. The two parts A and B also have each projections inward toward each other at both ends of the facing or inner side, bounded toward the center of the quoin by planes la k, inclined at an angle of forty-ve degrees to the outer or bearing planes, f g. When placed in position, as illustrated in the drawings, the parts A and B meet at both ends, but leave openings between for the two parts G and D and the part E. The two parts C and D, being opposite and similar in construction, are bounded on the sides farthest from the center of the quoin by two planes at right angles to each other, and

at angles of forty-five degrees to the outer or bearing planes of the quoin, fg, and on the side toward the center are countersunk as portions of the same circle, and bear sections of center of the quoin, the fianges having on their inner faces a scroll-thread which engages with the sections of the similar thread on the parts A and B, C and D, so that by the rotation of the part E, by means of a key or other suitable instrument, the four parts A B C D are eX- panded outward from the center. The parts A and B,in separating from each other in one direction, lock up the form, while the parts Gand D,moving at right angles to that direction and acting as wedges, compel the parts A and B to remain ever parallel. y

l claim as my invention and desire to secure by Letters Patent the following, viz:

1. The combination, in aprinters quoin, of two outer or bearing parts, A and B, arranged on opposite sides of a spool or cylinder, E, and bearing sections of scroll-threads, which engage With similar scroll-threads on the iianges of said spool or cylinder, so as to be moved apart by its rotation, and also between said bearing parts A and B two other parts, C and D, similar to each other and on opposite sides of said spool E, and wedge-shaped,by virtue of which shape, when forced apart at the same time and in the same manner as the parts A and B, they compel those parts to remain ever parallel. Y

2. In a printers quoin, the combination of live parts, of which the central part is cylindrical, with flanges bearing scrollthreads, which threads engage with sections of similar scroll-threads on each of the other parts, so that by the rotation of said central part the other parts are separated from each other in pairs, one pair bearing aga-inst the chase and form, respectively, andthe other pair acting as wedges between them,so as to open their ends equally, and thus to preserve their parallelism, substantially as described.

v WILLIAM R. WHITMORE. Witnesses:

E. S. DUNHAM, NATHANIEL N. JONES. 

